... , welded pipes, mirror-polish pipes, and special pipes Stainless Steel Pipe1) Types: seamless pipes, square pipes, rectangular pipes ... 1 to 40mm 5) Grades: 321, 304, 304L, 316, 316L, 310S, etc.6) Standards: GB, ASTM, JIS, DIN ... : Chemical Industry, Petroleum, Medicine, Food, Machinery, Construction; space, War Industry, Hardware, Boilers, Heat Exchangers, Ships And Electricity stainless steel Pipe